无法调用火狐硒在Python AWS机上 [英] unable to call firefox from selenium in python on AWS machine

问题描述

我想使用硒从Python来凑了一些动态页面的JavaScript。但是，我不能叫火狐后，我跟着硒的PyPI页（http://pypi.python.org/pypi/selenium）的指令。我在AWS上的Ubuntu 12.04安装Firefox浏览器。我得到的错误信息是：

I am trying to use selenium from python to scrape some dynamics pages with javascript. However, I cannot call firefox after I followed the instruction of selenium on the pypi page(http://pypi.python.org/pypi/selenium). I installed firefox on AWS ubuntu 12.04. The error message I got is:

In [1]: from selenium import webdriver

In [2]: br = webdriver.Firefox()
---------------------------------------------------------------------------
WebDriverException                        Traceback (most recent call last)
/home/ubuntu/<ipython-input-2-d6a5d754ea44> in <module>()
----> 1 br = webdriver.Firefox()

/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/webdriver.pyc in __init__(self, firefox_profile, firefox_binary, timeout)
     49         RemoteWebDriver.__init__(self,
     50             command_executor=ExtensionConnection("127.0.0.1", self.profile,
---> 51             self.binary, timeout),
     52             desired_capabilities=DesiredCapabilities.FIREFOX)
     53

/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/extension_connection.pyc in __init__(self, host, firefox_profile, firefox_binary, timeout)
     45         self.profile.add_extension()
     46
---> 47         self.binary.launch_browser(self.profile)
     48         _URL = "http://%s:%d/hub" % (HOST, PORT)
     49         RemoteConnection.__init__(

/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/firefox_binary.pyc in launch_browser(self, profile)
     42
     43         self._start_from_profile_path(self.profile.path)
---> 44         self._wait_until_connectable()
     45
     46     def kill(self):

/usr/local/lib/python2.7/dist-packages/selenium/webdriver/firefox/firefox_binary.pyc in _wait_until_connectable(self)
     79                 raise WebDriverException("The browser appears to have exited "
     80                       "before we could connect. The output was: %s" %
---> 81                       self._get_firefox_output())
     82             if count == 30:
     83                 self.kill()

WebDriverException: Message: 'The browser appears to have exited before we could connect. The output was: Error: no display specified\n'

我没有在网上搜索，并发现此问题发生的与其他人（https://groups.google.com/forum/?fromgroups=#!topic/selenium-users/21sJrOJULZY）。但我不明白的解决方案，如果是。

I did search on the web and found that this problem happened with other people (https://groups.google.com/forum/?fromgroups=#!topic/selenium-users/21sJrOJULZY). But I don't understand the solution, if it is.

任何人能帮助我吗？谢谢！

Can anyone help me please? Thanks!

推荐答案

现在的问题是Firefox的需要显示器。我用 pyvirtualdisplay 在我的例子来模拟显示。解决的办法是：

The problem is Firefox requires a display. I've used pyvirtualdisplay in my example to simulate a display. The solution is:

from pyvirtualdisplay import Display
from selenium import webdriver

display = Display(visible=0, size=(1024, 768))
display.start()

driver= webdriver.Firefox()
driver.get("http://www.somewebsite.com/")

<---some code--->

driver.close()
display.stop()

请注意，pyvirtualdisplay需要以下的后端之一：Xvfb来，Xephyr，Xvnc的

这应该解决您的问题。

这篇关于无法调用火狐硒在Python AWS机上的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！